Staircase.



O. H. OLPE.

STAIRCASE.

APPLICATION FILED MAR. 15, 1912.

1,051,753. Patented Jan.28,1913.

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UNITED STATES PATENT OFFICE.

OTTO I-I. OLFE, OF ST. LOUIS, MISSOURI, ASSIGNOR T0 BANNER IRON WORKS, OF ST.

LOUIS, MISSOURI, A CORPORATION.

STAIRCASE.

To all whom it may concern:

Be it known that I, O'r'ro H. Own, a citizen of the United States of America, and a resident of the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Staircases, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to staircases, and more particularly to staircases having molded treads, preferably of concrete.

One of the objects of the invention is to provide in any staircase pan-like molds for the step treads and which are permanently arranged in the staircase containing them, in order that they may serve as protecting members for the material molded therein.

Another object of the invention is to provide treads of the kind mentioned having metal nosings that relieve the edges of the metal treads of wear.

Another object of the invention is to provide in a staircase having molded treads risers located between the treads which serve to hold the molded treads in position, and which are so formed in juxtaposition to the treads as to make it possible to keep the treads in a more sanitary condition than would be the case without such a formation.

Another object of the invention is to provide a construction of staircase of the kind mentioned in which risers may be utilized or dispensed with.

Figure I is a top or plan view of two steps of my staircase with one of the step treads partly broken out, and one of the risers shown in horizontal section. Fig. II is an enlarged vertical cross section through two of the staircase steps, one of the steps being shown in a completed condition, and the other step being shown as it appears previous to being filled with concrete or other material that is to be molded thereinto to produce the tread. Fig. III is an enlarged section through the nosing of one of the staircase tread shells and the upper portions of one of the risers therebeneath. Fig. IV is an enlarged vertical section through the rear portion of one of the tread shells and a fragment of a riser secured thereto.

In the drawings :1 designates the one piece metal shells of the treads of my staircase which may be secured in any suitable Specification of Letters Patent.

Application filed March 15, 1912.

Patented Jan. 28, 1913-.

Serial No. 683,927.

manner between and closely fitted to the sides A of the staircase by which said treads are supported. In the present instance the tread shells are supported by right angle shapes each having one flange bolted to the side of a staircase and the tread shell bolted to the underside of the other flange of the shape. The tread shells 1 are formed at their rear edges with vertical flanges 2 and at their forward edges with nosing flanges 3 having rearwardly turned lips 4. The nosing flanges may extend forwardly at angles to perpendicular lines, as illustrated in the drawings, or they may extend perpendicularly from the bottoms of the tread shells. The tread shells 1 are made of metal, preferably steel, and they constitute pan or trough like receptacles, in which treads B, of concrete, or other suitable material, may be molded and contain, if desired, a reinforcement, such as that illustrated at C in the drawings. Vhen the, treads B are molded into the tread shells, they are formed permanently therein and the shells afterward serve as containers and backings for the molded treads to protect and reinforce them, and also make it possible to produce a series of treads with a minimum quantity of concrete therein. The nosing flanges 3 effectually protect the front faces and top edges of the molding treads for the reason that they furnish wearin tread edges and, inasmuch as these treac l, edges extend rearwardly, as provided for by the lips 4, there is absolute prevention of the chipping of the upper corners of the molding treads.

5 designates metal risers located between the tread shells 1 and having rearwardly extending flanges 6 at their upper edges that are connected by bolts 7 or other suitable fastening means, to the tread shells above them. The risers are located in front of and adapted to be connected to the vertical rear flanges of the tread shellsbeneath them by bolts 8, and they are provided adjacent their lower edges with forwardly inclined flanges 9, which terminate in horizontal lips 10. The risers are so connected to the rear flanges of the tread shells as to provide for the flanges 9 extending forwardly from the rear flanges of the tread shells above the horizontal planes of the molding treads B, and to provide for the lips 10 being embedded in the molded treadswith their top surfaces in the same horizontal planes as the top surfaces of the nosing lips 4. The flanges 9 being disposed, as stated, obviate the presence of sharp corners at the backs of the treads so that the treads may be more readily cleansed than is the case where sharp corners exist in staircases. The lips 10 being disposed in the same horizontal planes as the nosing lips 4 are in proper positions to serve as gages to guide finishing implements used in finishing the molded treads, and which are guided also on the nosing flange lips 4. v

It is to be noted that inasmuch as the metal risers 5 are arranged to be bolted to the tread shells of my staircase, said risers may be readily attached to the tread shells when it is desired to use them; or if it is desired to produce a staircase without risers, they may be readily dispensed with without interfering with the remainder of the structure.

An import-ant feature of the metal shells 1 of my staircase is that the shells are each made of one piece of metal, thereby dispensing with any joints through which the concrete introduced in the shells in a wet condition may flow. The one piece construction of the shells also prevents the passage of dust between the concrete filling in the pan in the event of shrinkage. Attention is also directed to the fact that the vertical flanges 2 at the rear edges of the metal shells are of greater height than the forward portions of the shells, so that there is no opportunity-for the concrete filling flowing over these flanges when it is being molded in the shells.

I claim:

A staircase of the character described comprising tread shells each composed of a single sheet of metal formed with a front nosing having a rearwardly extending horizontal lip 4 and an upwardly extending rear flange 2, said rear flange being of greater height than said nosing, a metal riser 5 extending from saidrear flange to the next adjacent tread shell, rivets 8 connecting said rear flange to said riser, the said riser having a flange which extends forwardly and downwardly from said rivets 8 and terminates in a horizontal lip 10, the said horizontal lips 10 and l being flush with each other, and a concrete filling, the

surface of which is flush with the surface of A. J. MOCAULEY, E. B. LINN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

